PROJECT TITLE :

On-body semi-electrically-small tag antenna for ultra high frequency radio-frequency identification platform-tolerant applications

ABSTRACT:

In this study, the authors proposed the impedance-flexible on-body semi-electrically-tiny tag antenna for the European ultra-high frequency radio-frequency identification (UHF RFID) frequency band. The radiator relies on differentially-fed coupled shorted-patches and vertical folding techniques, using a loop excitation. The proposed excitation ways enable the input impedance to be tuned to the advanced impedance of typical UHF RFID chips likewise on 50 Ω impedance. In addition, the virtual electrical short applied inside the structure simplifies the topology and manufacture. The antenna dimensions are forty × fifty × 3 mm3 (zero.twelve × zero.14 × zero.01 λ0) and represent the electrical size ka = 0.58 at 86six MHz. The whole potency measured in open space exceeds sixty%. In case that the antenna is situated on an individual's phantom, it accounts for fifty%. Accordingly, the antenna provides the scan range of 5.6 m (in open house) and 5.1 m (when located on human chest).